I plan to take all of my lenses; including a macro. The macro and 105 will probably stay in the case in my car.
My idea, is to set up both camera, each on a tripod.
I hired a guide for three days. (I suppose the a more accurate description is that he and are corresponding via email and we have tentative dates set; no money has been transferred so he is not hired, not yet).
If I get nothing this time, I'll try again later. Yellowstone will still be there in the fall and probably next winter also.